We know most/all of these people have a conclusion, and pick whatever argument they have at support that conclusion. There's no convincing these people with argument: they will just move the goal posts and/or claim any evidence is suspect.
The best strategy to get to 95+% compliance appears to be mandates.
I have spoken with a few "anti-covid-vaccine" people who use this fact as a reason to not get it "It does not work, why should we get it?"
I wonder if this was better communicated at the start would have made more people, or less people get the vaccine.